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I've lost my Firefox Sync account information - What to do

Firefox Sync works by storing your data on Mozilla servers and synchronizing it with your computers and devices. When you set up Sync, you enter an email address and password in order to prevent others from accessing your account. In addition, we encrypt your data with a key derived from your password in order to keep it safe on the server. This article explains what to do if you forget or lose any of this important information and are unable to access your Sync account.

I’ve forgotten my Firefox Account password — how do I reset it?

Warning: Any data you have on the server will be erased when you reset your password. Your other devices will stop synchronizing unless you update them with the new password.

At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

Click the menu button
and choose Options.Preferences.

On the Sync tab, click Sign in to open the Sign in page.

On the Sign in page, click Forgot password? Firefox will send you a reset email.

Follow the instructions in your reset email to change your password.

Now you're ready to go. Remember to update your password on each of your synchronized devices by following the steps below:

At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

Unfortunately there's no way to change or recover the email address associated with a Sync account. You would need to create a new account following the steps described in How do I set up Sync on my computer?